[Numpy-discussion] New patch for new mgrid / ogrid functionality
Mon Sep 22 03:53:29 CDT 2008
On Mon, Sep 22, 2008 at 09:40:42AM +0200, Stéfan van der Walt wrote:
> 2008/9/19 David M. Kaplan <David.Kaplan@ird.fr>:
> > My 2 cents - I personally think the version that always returns a list
> > will ultimately be more transparent and cause fewer problems than the
> > newer version. In either case, the plan should be to eventually have it
> > always return a list as that is the only fully consistent option, the
> > question is just when that switch should be made and by who. If it is
> > done at the next major release, someone else will have to remember to ax
> > the additional code and correct the documentation....
> I think this change is worth making, because:
> - It provides a consistent API for gridding.
> - It optimises the most frequenty used situation:
> x, y, z = ogrid[...]
> - Someone already took the trouble of writing the patch.
> If the (minor) API breakage is considered a problem, could we go
> through the standard deprecation process and have this included?
I must admit I don't really like the API breakage. People will find out
that some code that used to work doesn't work anymore.
In addition there is some real usecase behind the mgrid behavior:
X = mgrid[0:4, 0:4, 0:4]
X = X.reshape((3, -1))
scatter(X[0, :], X[1, :])
R = matrix(((cos(0.5), sin(0.5), 0), (-sin(0.5), cos(0.5), 0), (0, 0, 1)))
Y = array(R*X)
scatter(Y[0, :], Y[1, :], color='r')
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